JP2011168469A - Waste gypsum regeneration processed material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To recycle waste gypsum of an environmental pollution waste material into a harmless water permeable material (a board or a pipe) by processing the waste gypsum with a chemical to make harmless and joining with a resin. <P>SOLUTION: A pulverized material of the waste gypsum is coated with a hydrolyzed aqueous solution using 0.02-1% silane coupling agent and dried or an unsaturated polyester resin made by mixing 0.5-4% non-hydrolyzed coupling agent with a resin is added into the pulverized material of the waste gypsum by 10-30% to mold and cure as an integrated composite material. In such a case, the amount of fluorine to be eluted into water from the composite material is controlled to ≤0.8 ppm of the environmental standard. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to detoxification treatment of waste gypsum and its reuse.

The present invention has developed a material that can be reused harmlessly by treating waste gypsum, an environmental pollutant that has no use.

The present invention produces useful waste gypsum treated products by treating them with various chemicals in order to make environmental pollutants such as fluorine compounds eluted from waste gypsum non-polluting and stabilized and reuse them as industrial materials. There is to do.

It is an object of the present invention to treat waste gypsum with a silane coupling agent and an unsaturated polyester resin so that the amount of elution based on environmental standards is 0.8 ppm or less.

The treated product obtained by the present invention is suitably reused for a permeable material {plate, tube} and the like.

Waste gypsum pulverized to 100-1000 microns and dilute acetic acid aqueous solution were mixed with silane coupling agent hydrolyzed. Heat drying with stirring (hereinafter referred to as polygypsum), then add 10-40% polyester resin to polygypsum and add and mix a small amount of curing agent 0.1-0.5% at the same time to batch drying Dry in a kettle or rotary kiln dryer. The coupling agent for bonding the waste gypsum surface and the resin may be anything such as silicon or fatty acid, and examples thereof include the following. In the general formula RSi (OR ′), R is a functional group and is an aminopropyl group, glycidoshi, methacryloxy group, N-henylaminopropyl group, mercato group, vinyl group, etc. R ′ is a methyl group, and an ethyl group silane coupling agent is water. When it comes into contact, it hydrolyzes to form a silanol group.

Silanol groups are polymerized by self-condensation and at the same time chemically bonded to OH groups on the metal surface by an acid-base salt reaction. On the other hand, the functional group R is firmly bonded to the paint component by chemical bonding or crosslinking. The advantage of the silane coupling agent is that it dissolves in a water / methanol solution and can be effectively used alone even at 1% or less. Specific examples include Shin-Etsu Chemical's KBM-13 methylmethoxysilane KBE22 dimethyldiethoxysilane and KBM503 acrylic silane. The unsaturated polyester resin is usually added at least about 10 to 40% with respect to the poly waste gypsum and needs to cover the surface of the waste gypsum, and an appropriate amount of a curing agent curing accelerator is added to the resin. The treated waste gypsum treated product has a water elution fluorine of 0.8 ppm or less ({discharge standard) when 10% is added, and the amount of elution further decreases as the addition amount increases.

Sprinkle 0.01 kg hydrolyzed KBM575 on 100-1000 micron waste gypsum 40KG and heat dry with stirring. Mix silane-coupled polygypsum with unsaturated polyester resin {eg Poropor R4701} 20KG, hardener [eg Parmec N] 0.2KG cure accelerator [eg cobalt naphthenate] 0.1KG and centrifuge Inject into the rotary mold of the molding machine. Thereafter, it is dried by heating [around 110 ° C.] to obtain a water permeable tube. The obtained permeation pipe has an elution amount of the fluorine compound of 0.1 ppm and below the standard 0.8 ppm, maintains the shape of the target pipe having a thickness of about 25 to 30 mm with a diameter of 250 mm, and has the same strength as a concrete pipe. A water permeability of about 1 L / m ² · min was obtained.

100-1000 micron waste gypsum 40KG, unsaturated polyester resin {eg Poropor R4701} 20KG, hardener [eg Parmec N] 0.2KG cure accelerator (eg cobalt naphthenate) 0.1KG, KMB403 0 .4 kg Particle dispersion composite material, which is added and mixed without being hydrolyzed and mixed with a diffusion resin, is injected into a rotary mold of a centrifugal molding machine and subjected to centrifugal molding. Thereafter, it is dried by heating [around 110 ° C.] to obtain a water permeable tube. The obtained permeation pipe has an elution amount of the fluorine compound of 0.2 ppm, which is 0.8 ppm or less of the standard, maintains the shape of the target pipe having a thickness of about 25 to 30 mm with a diameter of 250 mm, and has the same strength as a concrete pipe. A water permeability of about 1 L / m ² · min was obtained.

Claims (2)

Unsaturation formed by pulverizing waste gypsum and drying surface coating with hydrolyzed aqueous solution using 0.02% to 1% silane coupling agent, or resin mixing with 0.5-4% unhydrolyzed coupling agent Recycled processed product made of waste gypsum with 10-30% polyester resin added to form and cure an integral composite material, and the amount of water elution of fluorine from the composite material was reduced to 0.8 ppm or less of the environmental standard. The waste gypsum according to claim 1 is used to adjust the resin addition amount of the filling material and the molding pressure so as to have a large number of airways communicating between the composite material bodies, and to make the airway into an integrated structure. A plate or tube of permeable material used for permeable purposes.